Dynamic Baseline Integration Routines for Volatile Contaminant Interference Subtraction
Adaptive baseline subtraction routines isolate volatile contaminant peaks from matrix background noise, preventing costly false positive resin lot rejections.
Standard Addition Method
Meaning
Laboratory protocols for quantification involve adding known quantities of a target substance directly into a sample to compensate for matrix effects. Using the standard addition method allows a chemist to calculate the original concentration of an additive in a polymer even when the resin itself interferes with the detector signal. This technique is often used when a pure matrix-free version of the sample is not available for standard calibration.
Matrix Matching
Creating a calibration curve inside the actual sample environment ensures that the response of the analyte is measured under real-world conditions. If the polymer slows down the release of a volatile compound, the standard addition method will reflect this change. This leads to much more accurate results than using an external calibration curve made in a clean solvent.
Recovery Rate
Comparing the expected increase in signal to the actual measured increase provides a measure of how well the method is working. A low recovery rate indicates that the matrix is suppressing the signal or that the analyte is being lost during the process. This internal check is a major advantage of the standard addition approach.
Quantitative Precision
Measuring several different additions allows the lab to plot a line that intersects the concentration axis at the negative of the original amount. This mathematical extrapolation provides a precise value for the unknown concentration. It is the preferred method for high-stakes testing where accuracy is the primary requirement.